scholarly journals Study on Quality Control of Concrete Raw Materials in Road and Bridge Construction

2021 ◽  
Vol 4 (1) ◽  
pp. 22
Author(s):  
Suqin Han ◽  
Xiuyong Ni ◽  
Ruimin Huang

The main material of concrete is a construction building material composed of water and mineral mixture and cement and chemical additives in the corresponding proportion and below the standard. In the process of making concrete material, slurry and cement are needed to mix, then cement slurry and sand are mixed into mortar according to the corresponding proportion, and aggregate is added to mortar to form concrete building material. In the process of concrete preparation, the most important construction link is mixing, which needs to be fully stirred to make the performance of concrete meet the construction needs. In the process of concrete construction technology development, both mix ratio and production technology have become more and more mature, but there are still some problems, which have an impact on the quality of concrete. Therefore, this paper discusses the quality control of concrete raw materials according to the construction process of road and bridge.

AGROINTEK ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 72
Author(s):  
Andan Linggar Rucitra ◽  
S Fadiah

<p><em>Telon oil is</em><em> one of </em><em> </em><em>the </em><em>traditional medicine in the form of </em><em> </em><em>liquid preparations that serves to provide a sense of warmth to the wearer. PT</em><em>.X</em><em> is one of the companies that produce</em><em> </em><em>telon</em><em> oil</em><em>.</em><em> To maintain</em><em> the quality of telon oil from PT.X</em><em> product</em><em>, required overall quality control that is starting from the quality control of raw materials, quality control process to the quality control of the final product. The purpose of this research is to know the application of Statistical Quality Control (SQC) in controlling the quality of telon oil in PT X. </em><em>F</em><em>inal product</em><em> quality</em><em> become one of the measurement of success of a process, so it needs a good quality control. SQC method used in this research is Pareto Diagram and Cause and Effect Diagram. Pareto diagram is a bar graph </em><em>that </em><em>show the problem based on the order of the number of occurrences of the most number of problems until the least happened. A causal diagram is often called a fishbone diagram, a tool for identifying potential causes of an effect or problem. The result of applying the method indicates that 80% defect is caused by unsuitable volume and on the incompatibility of Expired Date (ED) code. The damage is caused by several factors namely the method, labor, and machine while the most potential factor is the volume conformity to reduce the number of defect products.</em></p>


Author(s):  
Janmejay Pant ◽  
. Ripudhaman

Standardization in Ayurvedic formulations ensures the establishment of standards for the quality and purity of raw materials, quality control during the drug manufacturing process, production of a good quality finished product, storage and distribution to maintain the quality of the final product. It is an essential tool for establishing quality control methods for Ayurvedic drugs. In Ayurveda, standardization has been well defined and documented in the classical and contemporary texts. Still, these have been written with an individualistic intent and not for industrial or commercial purposes.  Careful contemplation of the classical literature of Ayurveda was done, the current guidelines of WHO on standardization of herbal drugs, latest researches on the same via the internet were explored and examined in the purview of the newest standardization procedures.  In this article, an attempt has been made to bring to light the classical references related to standardization, the milestones in this on-going pursuit have been exhibited, with the use of the latest scientific methods being incorporated for a standardized Ayurvedic drug. It can be concluded from the review that standardization in Ayurveda is an on-going process where one needs to be strictly vigilant about the new scientific methods to study the fine chemical procedures and the intermediate compounds formed, but at the same time be aware of the classical. Ayurvedic methods concepts of the procedure. Asava-arista's medicinal characteristics of Ayurvedic classical dosage forms, liquid dosage forms based on self-generated alcohol with faster absorption, long shelf life, and increased market conformity have led to a continuous rise in demand. New fermentation methods and packaging innovations tend to have been embraced by many Ayurvedic processing units. The importance of standardization of such goods is underlined by these advances in manufacturing, distribution and storage. Therefore, it is of concern to examine the latest manufacturing situation and the standardization of the dosage type regarding the procedure and the consistency and effectiveness of the finished product. In addition to the effort to include criteria of consistency and standardization, the study consists of an overview and deliberates on the importance of improvements made to the conventional preparation processes, ingredients and material used in the process and the potential impact on its efficacy.


2011 ◽  
Vol 71-78 ◽  
pp. 4115-4119
Author(s):  
Xiao Qiu Ma

To ensure the construction quality of EPS external wall thermal insulation system , need to controll raw materials, construction conditions, construction methods and quality control acceptance criteria and other aspects


2013 ◽  
Vol 423-426 ◽  
pp. 1090-1095 ◽  
Author(s):  
Yong Min Yang ◽  
Jie Long Cai ◽  
Ze Peng Chen

Moderate Heat Portland Cement is not only frequently-used cement for dam but also one of the largest amount of special cement as a main cementitious materials of concrete in hydraulic structure in China. Due to the high quality requirement and the complicated technology in the construction of dam, a series of measures are adopted to control the production quality of Moderate Heat Portland Cement used in the dam construction. In this paper, the measures of production quality control of the Moderate Heat Portland Cement are introduced, including controlling the raw materials such as the cement raw meal, fuel, clinker and gypsum, managing the discharge from the mill and the entrance test, which ensure that the various targets of physical and mechanical indexes are in accordance with the standard requirement. Moreover, the engineering quality of Roller Compacted Concrete (RCC) for the dam is effectively guaranteed through the lower pot temperature and the less hydration heat. The construction experience is available for the like-kind engineering interiorly.


2018 ◽  
Vol 64 ◽  
Author(s):  
N.V. Bespalova ◽  
M.M. Gomola ◽  
T.I. Yakovleva

The article is devoted to the urgent theoretical and practical problems of the quality control of the chocolate confectionery products in cafes and restaurants. The authors analyze the modern approaches to the quality control of the chocolate confectionery products. The practical recommendations can be useful for the process of selection of the high quality raw materials. The criteria for the quality control of the chocolate confectionery products have been given. Some ways to improve the quality of he chocolate confectionery products have been discussed.


2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Listiani Listiani

This research is aimed to determine the quality control system of production process in PT Industri Sandang Nusantara unit Patal Secang, measure the efectivity of quality control system by using control P-Chart and determine factors that cause defect product. This research is explorative descriptive by case study method. Data used in this research is the procedure of production process and the number of defect product. Product used in this company is  thread R30/1 UW and R 40/1 UW PT Industri Sandang Nusantara Unit Patal Secang in 24 periods of production between April – Mei 2006. Data is collected by interview, documentation, and observation. Data is analyzed by control p-chart and fish bone diagram. The conclusion of this research are: (1) The quality control system which is consists of controlling raw materials, production process and final product is appropriate with the company’s standard; (2) the number of defect product R 30/1 UW is 26.956 bale with the average 0.0167; Control P Chart shows that there are three periods which are out of control. They are in April 30, Mei 5 and 21, 2006. (3) The number of final product R 40/1 UW is 2159 bale with the average 0.0214; control p-chart shows that there are tw periods which are out of control. They are ini Mei 6 and Mei 12, 2006. (4) Factors that cause defect product are obsolete machines, employee performance, control system, and raw materials. Based on that condition, management should impove the controlling of machines, improve motivation and commitment of the employee, improve the method of inspection and control the quality of raw materials.


2020 ◽  
Author(s):  
Aleksander Litovchenko

The book presents the path of production development of honey wine, from the times of Kievan Rus to the present. A deep analysis of culture, honey winemaking, one of the best in its time in world practice, shows what heights were achieved, and how more than a century ago this art was lost. There were many different unsubstantiated sentences, primitive literature, in no way restoring the glory of our great ancestors and not meeting modern requirements for making wines in general. In the last century, as in the entire post-Soviet space, and in Ukraine, the use of honey in winemaking was prohibited and there were ao standard documents on its use for this purpose. The author, with the support of the country's government, while fulfilling the task of the Cabinet of Ministers of Ukraine to improve the quality of fruit and berry wines, produced at that time, it was possible to convince the country's leadership of the need to use honey for the preparation of high-quality honey fruit and berry wines. For this purpose, technical conditions TUU 202.13.022-99 were proposed, developed, and approved "Fruit and berry dessert wines with aromatic additives", where, in addition to the use of fruit and berry, spicy, aromatic, and medicinal raw materials, the use of honey was first laid. For the first time according to TUU, a number of honey wines were developed, approved, and mastered in produccion. At international competicions, such wines have received the highest awards, gold medals, and Grand Prix cups. Subsequently, with the participation of the largest scientific centers, GOST (DSTU 6036: 2008) was prepared. Fruit and berry wines, general technical conditions, in which the production of honey wines arc separated into another group. These regulatory documents fully regulate the production, release, and quality control of honey wines in Ukraine. The author offers a broad overview of the basic terrns and designations necessary for the production of high-quality fruit and berry honey wines. Provides and explains the modem requirements for the classification of honey wines, measures on safety, sanitation, and hygiene are seriously discussed, analyzes the main conditions and factors that detennine the quality of the necessary components, and the preparation of honey wines in general. Since honey wines can only be prepared using fruit and berry wines, including grape juices, the book provides the necessary overview in the processing of fruits, berries, grapes, the reception and quality control of raw materials, and the preparation of juices. Very important and inforrnative material is presented in the chapters on the selection and procurement of honey, for the preparation of honey fruit and berry and honey grape wines. Important sections on the impact of wine on the health and culn,re of wine consumption. The most common diseases and disadvantages of honey wines are described. A very informative and impressive list of honey wines, first developed in Ukraine under the guidance of the author, professor, doctor, technical sciences, Laureate of the State Prize of Ukraine in the field of science and technology Litovchentko A.M., in the amount of 48 items, practically from all raw materials available in Ukraine. To facilitate the work on the preparation of high-quality honey wines, 12 additional applications are presented, providing the main technological process of production. The book is of important practical, theoretical, and scientific interest.


Author(s):  
Muhammad Husen ◽  
Dayal Gustopo ◽  
Dimas Indra Laksmana

Quality is a key to be able to compete in the industrial world [16. Quality control is needed to reduce the number of defective products produced by the company, thus reducing losses experienced by the company. The Bima Mandiri Rembang Pasuruan cigarette company is a company that produces cigarettes, one of which is INNO cigarettes. The number of defective products produced by the company so that the company must make an increase in quality by using a method to reduce the number of defects that occur.  The number of defective products causes the company to suffer losses. For that, we need a method that can reduce cigarette defective products which in turn can improve the quality of the company's production[12]. Six Sigma with the DMAIC stage (Define, Measure, Analyze, Improve, Control) is a method used in this research. Based on these steps, defects that often occur are less dense cigarettes as many as 289 sticks with a percentage of 25%, tearing on the cigarettes as many as 227 cigarettes with a percentage of 20% and peeling cigarettes as many as 208 sticks with a percentage of 18%. Factors that cause defects include humans, machines, methods and materials. After calculating using the Six Sigma method, before the improvement, the DPMO value is 113988.1 and the Sigma Level value is 2.722. After the improvements were made, the DPMO value decreased to 76488.1 and the Sigma Level was 2.94715. To achieve the six sigma target, the company is expected to be able to carry out improvements with a focus on the factors that cause product defects and always carry out regular control to reduce product defects. The corrective steps taken in the Bima Mandiri Rembang Pasuruan Regency cigarette company are human: regular training for machine operators and employees; methods: inspection of raw materials, blending machines and glue residue in the teat; engine: inspection of engine components; material: reprocessing less refined raw materials and using better quality glue.


2017 ◽  
Author(s):  
Abdurrozzaq Hasibuan

Kaizen is a Japanese concept that means improvement continuous process to constantly improve the quality and productivity output. Stage of the data processing is done in this study using seven quality control tools (seven tools). From the results of the data processing is done by using the seven tools of quality control so visible damage that occurs feed the ash High temperatures, low water levels and the color is not uniform feed. Histogram and Pareto diagram showing the greatest amount of damage to small, the color is not uniform feed as many as 6800 Kg (41.34%), high ash content as much as 5050 Kg (30.70%) and low water levels as much as 4600 Kg (27.96%).Based on a causal diagram can be seen several causes defects in animal feed products C-281 human factors, among others, due to lack of skill or abilities of the workers themselves, less rigorous labor in performing measurements so the size does not match the required specifications. And factors that usually raw materials can cause defects in animal feed products C-281 is due to the quality of the raw materials are not in accordance with the standards set by the previous company. From the calculation of the map control is obtained that no data which are beyond the control chart or no data outside the control limits.


Author(s):  
E.V. ЕMELIYANOVA ◽  
◽  
N.N. KUCHIN

Fodder grain plays a priority role in ensuring high productivity of farm animals and poultry, revealing their genetic potential. Therefore, it is necessary to use the most advanced methods of grain preservation for the most complete preservation of the original feeding power. Such methods in recent years include the technology of sealed storage of raw fodder grain harvested before the complete maturation phase. Various biological and chemical additives are used to improve the preservation results. The use of such additives (due to the specific features of preserved raw materials) is obligatory. The authors conducted comparative tests of certain types of additives for processing raw fodder grains in the whole and flattened forms to determine the effect of different degree of compaction on the effectiveness of their preserving action. They made an experiment,and the quality of fermentation was determined using generally accepted methods. The raw grain isolated from air access is protected from spoilage due to acidification, so the effectiveness of using preservative additives was primarily determined by the effect on this indicator. The whole grain was put into storage with a higher moisture content (35%) than the flattened one (about 25%),which ensured its significantly better acidification regardless of the degree of compaction. A denser grain storage pattern provided better grain acidification regardless of grain moisture. From tested preparations, the flattened grain was better acidified by powdered sulphur at the medium degree of compaction for storage; the whole grain was better acidified by Biosil NN at the maximum degree of compaction. On average the preparations used in the experiment were arranged in the following sequence (as their influence on the degree of grain acidification weakened): powdered sulphur → biopreparations Biosil NN → chemical preservative Promir.


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